linux-kernel - Re: perf/x86/intel/uncore

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Date:   Fri, 25 Jan 2019 20:16:08 +0000
From:   Song Liu <songliubraving@...com>
To:     "Liang, Kan" <kan.liang@...ux.intel.com>
CC:     lkml <linux-kernel@...r.kernel.org>
Subject: Re: perf/x86/intel/uncore

Thanks Kan!

> On Jan 25, 2019, at 12:08 PM, Liang, Kan <kan.liang@...ux.intel.com> wrote:
> 
> 
> 
> On 1/25/2019 1:54 PM, Song Liu wrote:
>> Hi,
>> We are debugging an issue that skx_pci_uncores cannot be registered on
>> 8-socket system with Xeon Platinum 8176 CPUs. After poking around for a
>> while, I found it is caused by snbep_pci2phy_map_init() couldn't find
>> a unbox_dev:
>>   ubox_dev = pci_get_device(PCI_VENDOR_ID_INTEL, devid, ubox_dev);
>>   unbox_dev == NULL
>>   ...
>> The same kernel (Linus' master) works fine on some single socket SKX
>> systems.
>> I am not sure what to check next. And I am not sure whether this is
>> specific to this system (HPE Superdome Flex).
> 
> Could you please share the offset 0xC0 and 0xD4 of the PCI configuration space for each device which PCI ID is 0x2014?
> 
> snbep_pci2phy_map_init() tries to build a mapping from BUS# to Socket ID.
> CPUNODEID (0xc0) discloses the Node ID of current BUS.
> GIDNIDMAP (0xd4) discloses the mapping between Socket ID and Node ID.
> 
> Here is an example from a 4 socket SKX.
> BUS    CPUNODEID(bit2:0)    GIDNIDMAP
> 0x0    0x0            0x688
> 0x40    0x1            0x688
> 0x80    0x2            0x688
> 0xC0    0x3            0x688
> 

Here is the data I get:

# lspci -xxx | grep "86 80 14 20" -A 15 -B 1 | grep -e "86 80 14 20" -e c0: -e d0: -e Intel
0000:00:08.0 System peripheral: Intel Corporation Sky Lake-E Ubox Registers (rev 04)
00: 86 80 14 20 00 00 10 00 04 00 80 08 00 00 80 00
c0: 00 a0 00 00 2f 00 00 80 01 00 02 00 2f 2f 2f 20
d0: 02 00 00 00 88 d6 b6 00 01 00 00 00 00 00 00 00

0001:00:08.0 System peripheral: Intel Corporation Sky Lake-E Ubox Registers (rev 04)
00: 86 80 14 20 00 00 10 00 04 00 80 08 00 00 80 00
c0: 01 80 00 00 1f 00 00 80 01 00 02 00 1f 1f 1f 10
d0: 02 00 00 00 88 46 92 00 01 00 00 00 00 00 00 00

0002:00:08.0 System peripheral: Intel Corporation Sky Lake-E Ubox Registers (rev 04)
00: 86 80 14 20 00 00 10 00 04 00 80 08 00 00 80 00
c0: 02 e0 00 00 8f 00 00 80 01 00 02 00 8f 8f 8f 80
d0: 02 00 00 00 88 f6 ff 00 01 00 00 00 00 00 00 00

0003:00:08.0 System peripheral: Intel Corporation Sky Lake-E Ubox Registers (rev 04)
00: 86 80 14 20 00 00 10 00 04 00 80 08 00 00 80 00
c0: 03 c0 00 00 4f 00 00 80 01 00 02 00 4f 4f 4f 40
d0: 02 00 00 00 88 66 db 00 01 00 00 00 00 00 00 00

0004:00:08.0 System peripheral: Intel Corporation Sky Lake-E Ubox Registers (rev 04)
00: 86 80 14 20 00 00 10 00 04 00 80 08 00 00 80 00
c0: a0 b4 00 00 2f 00 00 80 01 00 02 00 2f 2f 2f 20
d0: 02 00 00 00 6d 8b 68 00 01 00 00 00 00 00 00 00

0005:00:08.0 System peripheral: Intel Corporation Sky Lake-E Ubox Registers (rev 04)
00: 86 80 14 20 00 00 10 00 04 00 80 08 00 00 80 00
c0: 81 90 00 00 1f 00 00 80 01 00 02 00 1f 1f 1f 10
d0: 02 00 00 00 24 89 68 00 01 00 00 00 00 00 00 00

0006:00:08.0 System peripheral: Intel Corporation Sky Lake-E Ubox Registers (rev 04)
00: 86 80 14 20 00 00 10 00 04 00 80 08 00 00 80 00
c0: e2 fc 00 00 8f 00 00 80 01 00 02 00 8f 8f 8f 80
d0: 02 00 00 00 ff 8f 68 00 01 00 00 00 00 00 00 00

0007:00:08.0 System peripheral: Intel Corporation Sky Lake-E Ubox Registers (rev 04)
00: 86 80 14 20 00 00 10 00 04 00 80 08 00 00 80 00
c0: c3 d8 00 00 4f 00 00 80 01 00 02 00 4f 4f 4f 40
d0: 02 00 00 00 b6 8d 68 00 01 00 00 00 00 00 00 00

Song
> 
>> One thing I noticed is that the PCI configuration space shows
>> subsystem vendor ID of 0x1590 instead of 0x8086:
>> 0000:00:08.0 System peripheral: Intel Corporation Sky Lake-E Ubox Registers (rev 04)
>> 00: 86 80 14 20 00 00 10 00 04 00 80 08 00 00 80 00
>> 10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>> 20: 00 00 00 00 00 00 00 00 00 00 00 00 90 15 14 20   << subsystem vendor
>> 30: 00 00 00 00 40 00 00 00 00 00 00 00 00 00 00 00
>> But I don't think that is the problem as the code search with PCI_ANY_ID.
>> 
> 
> It looks for the device with PCI ID 0x2014.
> 
> 
> Thanks,
> Kan